Just because a PSU is labeled 650w doesn't mean it really is better than lower rated PSUs.
Your CPU is running hotter than it should. Its normal for the machine to shut down if it reaches over 72C and the GPU is still fine. It won't run into trouble until 120C.
Your CPU is running hotter than it should. Its normal for the machine to shut down if it reaches over 72C and the GPU is still fine. It won't run into trouble until 120C.